Focusing attachment for cameras.



W. I'. FOLMER. FOGUBING ATTAGHMENT POB GAMEBAB.

2 907. 91 1 ,001. Patented Jan. 26. 1909. 3 SHEETS-SHEET 1.

a N .mwN

W. P. POLMER. roousma ATTACHMENT Fon GAMBBAS.

APPLIUAVTIDN FILED APB.24,1907.

Patented Jan. 26, 1909.

3 SHEETS-SHEET B.

vwantoz W. F. PGLMER.

FOCUBING ATTAUHMBNT FOB OAMERAS.

APPLIoA'rIoI FILED un. a4. 1901.

3 EERSTE-SHEET 3.

zUNITED STATES PATENT OFFICE.

wmllm r.' Forman-'or hummm,- uEw assreNon, BY M'esNE ASSIGNMENTS, 'ro- 'Kemm confiance 'soon-asma. NEW Year, A coerce-suon 0F NEW YRK.

I Bpedlcatlon'o! Lettori Pa'nt. Animation VlOApill 34, 1M. 'llll 10,309,008.

Tatentod dan. B6, 1909.

Ib'allwhomtmay lBe -it llmown that I, WILLIAM F. fFoLmrn of Rochester, in the county of Monroe an r State -of :New York, have invented certain new and `useful Improvements in Focusing Attachments for 'Cameras f and I do hereby -deelare the delle to be a full.; clear, :and: "eicaoht'tlileeclflilption1 fthe .samgitarefereme be- 1mg a test e-accom yingl wings, orm- 10 ing'apartof thespeldation, ant1=to theref lerencemumerils marked thereon. 2 :M present invention `relates to photo-f; gnap 'ccamerasand fparticularlyito the type E -employing aa :focusing screen 'and lens fsup-i 115 port, :movable :relatively to one another .nit lthe qlrop'ei`v fioousof *the `object to ibe La." A 'ofthefreiieeed' image, .fioritsobjectftorovine-'ang @menaient :in connection with t 'one 'cf| 2o .flrefab'ove members Whichfis ;movable on;

'the been or suppe y may Ibe net ipcsxtionedwgenerallv with freferi ence thereto, 'andecured 'and then `:brought j to a very ine lstate of ad ustment "by the use ef raccuratelg rcontroll :means operating; thnou hlallimitedmadhia. g .L @gather -nhject of 'invention iis ite l adapt a auf sto folding cenni ons fand itc am cimpromed -.:arrangement I. so 'whereby Y.the mm1 movable stationary ame movement); connected and; 11i ato suchzadsvantageasm be-.ecnaiact an yet readil accessible.

rome'ment-s fand combinations Koi parte' iall es `will -be hereinafter :more 'fully explained, :the 4novel features being pointed out Vian :the 'claims at the end 'of the specification.

2In'tlre drawings: Figure 1 isa central longitudinal sectional 'viewfof a folding-camera embodying ymy improvements, shown in ex- .tended position. F `2, is a similar view of the camera 4when fo ded. Fig). 3, isla rear f5 elevation with the 'extended ed shown in vsection'on'the line 3'^3 of 'F ig. 1. 11`ig.4,is 1i `central #vertical 'section of the adjusting mechanism l'and :adjacentparts taken longlftudnally through Vthe .be and Fig. `-5, is a 'ummm sew-.sho :in `swimwear@ .the

several major partsof t e saine mechanism intheir relative.4 sltionsforfaseembling.

Referringfto t e drawings, 1 indicates the india rame or bodv .portion Aof the Vcamera ift, lby means fof whi yit1 sa mmm 2, wihin which@ saedapmf.

-erably removable bneast, supporting the lens mount 4 and to which @body is attached one-end of the bellows 5. Hinged tothe rea fedgeof the bottom :portion 6 of the main `frame, is aniextension bed .7 provided with a central groove 8, in alinement and communicating with a similar groove 9 in the bottom piece forming a continuous guideway'vvhen the bed is extended as shown in Fig. 1. The Fbed `isfheld rigidly-in this-extended position by `bolts 9, which are secured inthe inner end of the bed land threaded into sockets in the bottom piece, being operated by the knu'rled'heads 10 (Figs. 2 and 'Operating longitudinally of the lbed -is a tongue a2 cooperating with the aguideway, which'cenriagesopportsraliramelca 'Y the'rfocusing attachments en 'the ,flrolderf-for the :sensitized material. ,Besides the member 12, it is 'also fprovided with o'oked'projections 41'coperatin with strips-42,pro1ecting laterally at bothsldes-of @the bed ;t0 fprevert 1its disenga ement :from 4the latter througbzany cause. heirame 13 ispilvotedctoathe canrlggecentrally at Hand movable, foi-.the neu purposes, in a lhoriontalzplanelintoivarious ositions of adjustcnentnwhereitisretaine 'by bolts 'L15 (Fig. f3). .The frame isupports la su emcmtal frame 116 pivoted iat 1,'7 to Whlc supplementaliramefis .attached retaining devices 1-8 .forztlre sensitized materials and .ground glass le). .The adjustment-of the latter-in a plane is secured `by means of a lead l@screw 20 :mounted on the Lfram'e 13 xand .threadsdrintofa projection21=cn the su le- .:meital'rame. t will be seen-from what' as been described, that when the camera is in foldedA osition, the carriage j11 rests entirely upon e bottom-piece 9, 'the bellows being collapsed; the frame V13 is adjacent the lens mount and the extension bed loosened by means of the 'disengaging of the bolts 9, la folded up in a vertlca ane in rear of 'the carriage -and its attac ments, as shown clearlyin I-i 2.

' Attached 1n any suitable manner to the rear'ofthe carriagell 1 is the leaf A22 ofahinge connection 223, the'otlier leafof whichliseir- .105 ltenl'e'd to Eforrn "a 'tongue12'4 which vfnorn'iall'gy extcnde'rearward parallel with 'thesrface of fthe Uediand Wil beherein'eter referred to.

The bottom of the groove 8 inthe bed 7 is extended laterally on .both isdes to form` a 1-10 i plate,

' wardly-pro] T-slot 25, (Fig. 3) within which slides freely a friction late or shoe 26 to which is preferably rigid y attached a threaded bolt 27, extendin vertically through the groove 8 and throng a sleeve 28 on a friction plate 29, sliding upon the upper surface of the bed. Rotatably mounted on the -sleeve 28 by means of a bushing 30, is an o erating disfc or knob 31, and inter osed ietween this knob and the friction (p ate 29 is the tongue 24, previously referre' to, provided wit a slot 32 to allow its longitudinal movement on a collar or enlar ed portion 33 at the base of the sleeve 2S, t e collar being of suflicient height or thickness to prevent the tongue from being tightly engaged/by; the opposed surfacesof the knob and friction plate. The tongue 24 is revented from rotary or lateral movement y being provided with two downwardly projecting studs or pins 34 which enter the groove 8 and also pass through longitudinal slots 35 in the friction reventing similar movement on the art ofp the latter, while upon the upper surace of the tongue adjacent the slot 32 is a stud 36 that cooperates by the spiral groove 37 in the knob or handle 31. The sleeve 28 projects to or beyond the upper surface of the handle31 and the bolt 27 projects beyond the sleeve to receive the threaded thumb nut 37, which, when tightened, at uts the end of the sleeve and clamps theprojecting portions of the hed between the slice or plate 26 and the friction plate 29, as will he readily understood.` The up- 'ecting end of the sleeve 2S is encircled by a washer 38 b earing against a sprin washer 39 interposed between said plate an the bushing 30, or against the upper surface of the'knob or handle so that when the thumb nut 37 is tightened, sufficient yielding ressure is exerted against the knob or han le to prevent too loose a movement thereof, the latter being held by the collar 33 from such contact with the tongue 24 as might otherwise tend to prevent the free movement thereof on the friction plate. It will be seen that when the carriage 11 is drawn toward the body portion of the camera, the pivotal center of the hinge 23 will be coincident with that of the connection between the bod and the bed, so that as the latter is folded into a vertical position, it will carry the clamping devices inst described, with it, rotating them to tie position shown in i ig. 2 and forming a firm and compact arrangement of the parts when so dis osed.

he o eration of the device is as follows: The be 7 is first extended and secured as previene-ly described, bringing?,v` the slots 8 and 9 in alinement and insubstantial continuation, permitting the o rator to grasp the knob or handle 31 and raw the carriage 11, supporting the focusing screen or plate,

with a cam formed rearwardly and slide it freely into an ap roximate focus which he determines by an inspection of the ima e on the screen, the thumb nut 37 being oosened to allow the freedom of movement required. Vi hen this position has been attained, the thumb nut is tightened, clamping the portions of the bed adjacent the slot 8 i'irmly between the shoe 26 and the friction plate 29 and exerting a slight binding pressure on the knob 31 by reason of the action of the spring washer 39. rIhe slight resistance thus offered to the movement of the knob prevents it from responding to accidental contacts, at the same time steadying its travel under the hands of the operator. It will be seen that when it is thereafter rotated the stud 36 on the tongue 24 will be forced to follow in the spiral slot 37, which gradually approaches the center of rotation and the tongue 24 will consequently move longitudinally of the bed between the knob and the friction plate, moving the carriage to which it is attached in the same direction. rlhrough all these movements the bolt 27 is held against rotation by the shoe 26, ,and the friction plate 29 and the tongue 24 are held in position b the studs 34 held closely in the slot 8. 'l e cam slot 37 is a true spiral generated by a point travelin circularly and radially with a constant an uniform velcity, so that the stud 36 sliding therein, approaches or recedes from the center of rotary movement with uniform rectilinear movement.

For the sake of lightness and to afford an agreeable hold for the hand of the operator, the knob 31 is preferabl made of wood or similar substance, in vi ich case it is aclvisable to provide it on its under side with a facing 4() of metal or other slow wearing materia which prevents the constant friction of the stud 36 from changing the contour of the cam. i y l A camera constructed in Vaccordance with my invention may ,be operated with the greatest facility, the knob 31 offerin a convenient grasp whereby the movable ocusing member may be quickl drawn to its approximate `osition on t e bed and secured, instead of eing slowly extended as in devices in which but a single adjusting mechanism is employed and that, necessarily, one

ivingr a comparativel gradual advance. ihe focus may then e accurately determined and the definition of the image erfected by the fine adjustment afor edp by the cam mechanism. The sensitiveness of thislatter may, asis apparent, be developed to any desired degree by simply regulating the radial increase per revolution in the form of the slot. i

I claim as my invention:

1. In a camera, the combination with a bed provided with a guideway, of a carriage i movable on the bed, a sliding member oper- Jim1 .atingin saisi guidway-and'cpnneted tothe carnage, lanoperating member 'on said sliding membercomprising a rotaryknobhavi :its axis in the centerfo the guideway an forming a hand-hold for Vmoving the carriage on the bed and means controlled by the rotation of said operating member for effecting adjustment of the carriage relatively to the slide. i

2. In a camera, the combination with a body portion and a bed hinged to said body portion, of a carriage movab e on the bed, an adjusting device mounted on the latter and a hinge connection between said adjusting device and the carriage, the axis of said hinge being movable to coincide with the axis of movement of thevbed and body.

3. In a camera, the combination with a bed and a carriage movable thereon, of a member movable on the bed, and adjustably connected to the carriage, a member for operating said adjustably connected parts relatively and means for exerting a yielding pressure on said operating member to prevent its accidental movement.

4. In a camera, the combination with a bed anda carriage movable thereon, of a member movable on the bed and adjustably connected to the carriage, a member for operating said adjustably connected parts relatively, and means for securing the movable member to the ybed and simultaneously exerting a yielding pressure on said operating member to prevent its accidental movement.

5. In a camera, the combination with a bed and a carriage movable thereon, of a rotary knob on the bed having a cam groove on its under side and a tongue on the carriage extending beneath the knob and having a projection thereon'coperating withthe groove and concealed beneath the knob.

6. In a camera, the combination with a bed and a carriage movable thereon and provided With a projection, of a rotary member on the bed and a spiral cam on said rotary member cooperating with the projection on 1ghz carriage for adjusting the latter on the 7. In a camera, the combination with a bed and a carriage movable thereon and provided With a projection, of a rotary member on the bed and a spiral cam on said rotary member coperating with the rejection on the carriage for adjusting the atter on the bed, said cam being formed by a spiral slot or groove of the form generated by a point traveling at a constant and uniform velocity radially and circumferentially of the axis of the rotary member.

8. In a cameraf the combination with a bed having a channel therein and a carriage movable thereon, of friction plates movable on opposite sides of a portion of said bed, one of said plates being provided with a slot and ,having eroi-.ary member mounted .themen i tongue on the camisas rotary member to adjust t with lig carriage ,on .the

`bedand a projectionon the .tpngueextend- 9. In a camera, the combination with a bed andy a carriage movable thereon, of friction platesmovable on opposite sides of a portion of said bed, a rejecting sleevefonone of said plates and a t readed bolt secured to the other and extending through the sleeve, a tongue on the carriage, a rotary member on the sleeve coperating with the tongue to move the latter longitudinall of the bed and a threaded nut on the bo t engaging the sleeve to clamp the friction plates to the bed.

10. In a camera, the combination with a bed and a carriage movable thereon and provided with a tongue having a slot therein, of friction plates movable on opposite sides of the bed, a projecting sleeve on one side of one of said lates havin an enlarged portion located m the slot 1n the tongue and a threaded bolt secured to the other plate andV sleeve to clamp the friction plates to the ed. s

11. In a camera, the combination with a bed and a carriage movable thereon, of friotion plates on opposite sides of a portion of said ed, a projecting sleeve on one of said plates and a threaded bolt secured to the other and extending through the sleeve, a rotary member en the sleeve coperatmg with the carriage to move the latter longitudinally of the bed', a threaded nut on the bolt engaging the sleeve to clamp the friction plates on the bed and a yielding member interposed between the nut and rotary member to exert a. yielding pressure on the latter when the nut is tightened.

A12. In a camera, the combination with a bed having a guideway and ak carriage movable on the bed, of friction plates arranged to bear upon opposite sides of a portion of the bed, means for clamping the lates to the bed, a rotary member mounte upon one of the plates, an adjustable connection between therotary member and the carriage and a projection on said connecting member engaging the saidl last mentioned plate and operating in the guideway.

13. In a camera, the combination with a bed provided with a guideway, of'a carriage movable on the bed, a sliding member operating in the guideway and adjustably connected to the carriage means including a rotary operating member for adjusting the carriage relatively to the slide and means for locking the slide upon the bed including a rotary Voperating member having its axis of rotation coincident with the axis of the operating member for the carriage adjusting means.

14. In a camera, the combination with a 5 bed provided with a guideway, of a carriage movable on the bed, a sliding member operating in the guideway and adjustably connected to the carriage, a clampingr bolt en# gaging one side of a portion of the bed, a

10 member mounted on the bolt and adapted to exert a clamping ressure on the opposite side of the bed an means for adjusting the carriage relatively to the slide embodgtylln an RUSSELL B. GRIFFITH, C. KETCHUM. 

